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BMW Cooling System Parts & Accessories for BMW 3 Series G20 (2019+)

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The cooling system is arguably the weakest point in numerous BMWs. If you drive an aging BMW or plan on taking your car to the track like we do, we recommend beefing up your cooling system before going to the track. Generally, the main components in your cooling system that are prone to failure include the following: expansion tank, factory hoses, water pump, thermostat, fan (especially if your vehicle comes factory with a clutch fan), and radiator. Factory BMW expansion tanks are plastic and prone to either breaking off at connection points or combusting. As factory rubber hoses age they either crack or break over time - we offer silicone cooling hose upgrades for most applications to avoid future failures. If you have an older vehicle, your water pump likely comes from the factory with a plastic impeller - we offer upgraded water pumps with metal impellers that are far more reliable. Newer model BMWs utilize electric water pumps - BMW spent millions of dollars engineering these water pumps, but they fail so often that we recommend replacing at 60,000 mile service intervals to avoid being stranded on the side of the road. In terms of thermostats, we offer various upgraded thermostats for racing applications. If your BMW utilizes a clutch fan from the factory, we have several options available in terms of universal electric fans - we recommend replacing these to avoid sending brittle plastic fan blades through your hood. For radiators, we recommend swapping out your radiator for one that does not use plastic connection points like your factory radiator.

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Genuine BMW water pump housing coolant flange - G-Chassis - B48TU (B4...

For B48TU Gen 2 applications (B46D/B48D)

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T#:48780791

Part#: 11515A74E79

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4% off MSRP $ 133.99

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$ 128.99 USD

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4% off MSRP

$ 133.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 128.99 USD

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Genuine BMW replacement coolant flange for back of water pump housing

Coolant Return Line

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T#:53856300

Part#: 11538650087

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Sale - Save 6% $ 60.99

This product was last offered at the strikethrough price on
06-29-2026

$ 57.46 USD

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$ 57.46 USD

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Rein Automotive turbo hoses are engineered to meet these rigorous demands, providing the reliability required for both the track and the street.

Water/Coolant Pump With Support

For models with the earlier B48D, B46D, or B46X engines and without the Energy Recovery...

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T#:49648357

Part#: 11518650988

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Sale - Save 17% $ 234.99

This product was last offered at the strikethrough price on
05-03-2026

$ 195.99 USD

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$ 234.99

This product was last offered at the strikethrough price on
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$ 195.99 USD

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Electronic Thermostat And Coolant Distribution Module

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T#:50311455

Part#: 11538843406

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Sale - Save 10% $ 397.99

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05-03-2026

$ 358.01 USD

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$ 358.01 USD

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CSF Universal Large Single-Pass Oil Cooler - Universal Application ...

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Universal fitment design - modifications may be necessary to run this cooler

T#:53608839

Part#: 8371

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$ 499.00 USD

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$ 499.00 USD

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CSF redesigned this cooler and went with a more traditional inlet/outlet orientation. The new single pass design features high efficiency and high durability, but with vertically oriented inlet and outlet connections.

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Rein Aluminum Oil Filter Housing - BMW B58

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T#:49404665

Part#: 11428583901

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Sale - Save 5% $ 408.99

This product was last offered at the strikethrough price on
06-29-2026

$ 388.03 USD

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$ 408.99

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$ 388.03 USD

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For those who push their engines to the limit, "good enough" is a liability. Upgrade to the Rein HEU0116 Aluminum Oil Filter Housing—the professional’s choice for durability and peace of mind.

Vargas Billet Coolant Block-Off - BMW B58 Engine

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T#:52094566

Part#: VTTFAB040BLKB58

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Sale - Save 15% $ 31.99

This product was last offered at the strikethrough price on
07-02-2026

$ 27.19 USD

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$ 31.99

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Engineered for precision and durability, the VTT-FAB-040 B58 Block-Off Flange is the definitive solution for managing oil and coolant paths during fabrication.

Vargas Billet HMM Delete Kit - BMW B58TU

Fits all B58 TU / Gen 2 B58 engines

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T#:51672725

Part#: VTT-B58-COOLING-

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Sale - Save 15% $ 199.99

This product was last offered at the strikethrough price on
07-02-2026

$ 169.99 USD

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$ 169.99 USD

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The VTT Billet B58 HMM Delete is for enthusiasts who want to remove the bulky, plastic factory coolant unit in favor of a robust, motorsport-oriented setup.

Vargas Remote Oil Cooler Adapter - BMW B58, Toyota A90/A91

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T#:51778122

Part#: VTT-B58-OIL-COOL

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Sale - Save 15% $ 157.99

This product was last offered at the strikethrough price on
07-02-2026

$ 133.87 USD

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$ 157.99

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$ 133.87 USD

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The VTT Billet B58 Remote Oil Cooler Adapter is an ideal upgrade for B58-powered platforms.

Genuine BMW Upper Radiator Cooant Hose - BMW G42 G20 G22/23/26 B48D/B...

For vehicles with a production date of 07/2021+ with Control DSC package (S8WEA)

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T#:49857443

Part#: 17125A44477

Ships in 4 Business Days

7% off MSRP $ 141.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 131.99 USD

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7% off MSRP

$ 141.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 131.99 USD

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Replace your old coolant hose with a brand new hose from Genuine BMW to eliminate coolant leaks and prevent overheating.

Genuine BMW Coolant Expansion Tank - Low Temp Circuit - BMW G20 G22/2...

For models with the later Gen3 engines only (B58N & B48P) - Not for use with the early ...

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T#:49857448

Part#: 17135A270D3

Ships in 5 Business Days

6% off MSRP $ 170.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 159.99 USD

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6% off MSRP

$ 170.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 159.99 USD

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If your coolant reservoir tank has cracked or if one of the mounting points has broken, this is the perfect replacement to ensure your coolant system remains leak-free. This reservoir specifically works with the low-temp circuit, which is responsible for cooling your manifold-integrated intercooler

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VEMO Electronic Thermostat And Coolant Distribution Module - BMW B58T...

For vehicles with the early B58C or B58D TU engine - Will not fit the B58N TU2 engine

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T#:52903296

Part#: V20-99-0005

Ships in 8 Business Days

$ 336.99 USD

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An electronic thermostat that is controlled by the car's computer for optimal control over the engine and coolant temperature. Internal valves are opened and closed by the vehicle's DME/ECU to achieve specific temperature targets for optimal engine efficiency and performance.

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VEMO Coolant Thermostat Assembly - BMW G20 G22/23 G30 B48 2.0L ...

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T#:49578587

Part#: V20-99-1310

Special Order: No Guaranteed ETA

$ 182.99 USD

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$ 182.99 USD

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Modern BMW thermostats are electronically controlled, allowing the DME/ECU to directly regulate coolant flow throughout the engine and its components. This system enables the thermostat to operate based on a broader range of temperature inputs, such as coolant, cylinder head, engine block, and oil temperatures, for more refined control of engine warm-up and temperature across diverse conditions. Unlike traditional thermostats, which simply open or close to permit coolant flow, this system uses a rotary valve for more dynamic control. The rotary valve adjusts to various positions, allowing for partial or full coolant flow to designated passageways as needed. This precision control helps your BMW's engine reach optimal temperatures quickly and ensures efficient heat management under various driving conditions.

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